Shaun Derry has warned Cambridge United's defenders they will need to be on top form against Sky Bet League Two's joint-top scorer Omar Bogle when Grimsby visit the Cambs Glass Stadium tomorrow.

Bogle has struck nine goals this term, level with Notts County's John Stead, following the Mariners' promotion from the Vanarama National League.

Derry is aware United will need to keep him quiet while putting in a positive performance themselves as they look to extend their unbeaten run to six games.

And captain Leon Legge and Brad Halliday are set to return to the defence following suspension, with Josh Coulson and Sean Long likely to make way.

"Omar Bogle was courted long and hard when he was at his previous club and Grimsby were brave enough to take him and he has taken them in the league and now he's their top scorer," said Derry. "He's a real handful, he scores his goals, he has got good link-up play, he's a big, strong boy and he's going to cause a lot of problems and we're going to have to make sure our defence are right on top of their game.

"Alongside Omar, we've come up against one or two other similar opponents this year so we have to make sure we learn our lessons from previous opponents who come under the same bracket and we have to make sure we take the game to them.

"I want us to be able to do that this weekend, I want us to take it into a weekend where if we can get points on the board, it takes us higher up the division."

Meanwhile, George Maris has returned to training after recovering from thigh and ankle injuries that have kept him out for two months, but Derry said it would still be another week or two before he would be back in contention for the squad.

Derry also confirmed United have been looking at Bowers & Pitsea striker Shomari Barnwell in training this week.

Barnwell has scored six goals for the Ryman League side this season and was invited for a trial after being spotted by United scouts.

Derry said: "He's just one of many players who we've had training with us this season.

"It's nothing unusual for League Two clubs to take players on for one or two days' training, but that's as far as it goes."